- Initialize *pcb to a large value before calling the stream-out
callback (to make applications that don't set *pcb at all happy).
- Don't flush the output stream when error condition is set.
to Phil Krylov's RTF generator code).
- New message implemented - WM_PASTE.
- RTF reader: rtfPlain implemented (kind of).
- RTF writer: rewritten main loop (the old one crashed in some
circumstances when SFF_SELECTION was used).